blob: 66e7f00884ab4b4443d51f56c211ae7ac6385f49 [file] [log] [blame]
* Copyright (C) ST-Ericsson SA 2011
* License Terms: GNU General Public License v2
* Author: Mattias Wallin <> for ST-Ericsson
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/clksrc-dbx500-prcmu.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/smp_twd.h>
#include <plat/mtu.h>
#include <mach/setup.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
static DEFINE_TWD_LOCAL_TIMER(u8500_twd_local_timer,
static void __init ux500_twd_init(void)
struct twd_local_timer *twd_local_timer;
int err;
/* Use this to switch local timer base if changed in new ASICs */
twd_local_timer = &u8500_twd_local_timer;
if (of_have_populated_dt())
else {
err = twd_local_timer_register(twd_local_timer);
if (err)
pr_err("twd_local_timer_register failed %d\n", err);
#define ux500_twd_init() do { } while(0)
const static struct of_device_id prcmu_timer_of_match[] __initconst = {
{ .compatible = "stericsson,db8500-prcmu-timer-4", },
{ },
static void __init ux500_timer_init(void)
void __iomem *mtu_timer_base;
void __iomem *prcmu_timer_base;
void __iomem *tmp_base;
struct device_node *np;
if (cpu_is_u8500_family()) {
mtu_timer_base = __io_address(U8500_MTU0_BASE);
prcmu_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE);
} else {
/* TODO: Once MTU has been DT:ed place code above into else. */
if (of_have_populated_dt()) {
#ifdef CONFIG_OF
np = of_find_matching_node(NULL, prcmu_timer_of_match);
if (!np)
goto dt_fail;
tmp_base = of_iomap(np, 0);
if (!tmp_base)
goto dt_fail;
prcmu_timer_base = tmp_base;
/* Doing it the old fashioned way. */
* Here we register the timerblocks active in the system.
* Localtimers (twd) is started when both cpu is up and running.
* MTU register a clocksource, clockevent and sched_clock.
* Since the MTU is located in the VAPE power domain
* it will be cleared in sleep which makes it unsuitable.
* We however need it as a timer tick (clockevent)
* during boot to calibrate delay until twd is started.
* RTC-RTT have problems as timer tick during boot since it is
* depending on delay which is not yet calibrated. RTC-RTT is in the
* always-on powerdomain and is used as clockevent instead of twd when
* sleeping.
* The PRCMU timer 4 register a clocksource and
* sched_clock with higher rating then MTU since is always-on.
static void ux500_timer_reset(void)
struct sys_timer ux500_timer = {
.init = ux500_timer_init,
.resume = ux500_timer_reset,